secondary structure: meaning, definition, pronunciation and examples
C2Specialist/Technical
Quick answer
What does “secondary structure” mean?
The local, regularly repeating three-dimensional folding patterns of a protein or nucleic acid chain, primarily stabilised by hydrogen bonds, such as alpha helices and beta sheets.
Audio
Pronunciation
Definition
Meaning and Definition
The local, regularly repeating three-dimensional folding patterns of a protein or nucleic acid chain, primarily stabilised by hydrogen bonds, such as alpha helices and beta sheets.
More broadly, any intermediate level of organised complexity in a system, particularly in materials science or data analysis, where local relationships form a repeating pattern that contributes to a larger, tertiary structure.
Dialectal Variation
British vs American Usage
Differences
Usage is identical in meaning and context across both varieties. Spelling differences are irrelevant as it is a compound noun.
Connotations
Purely technical. No regional connotations.
Frequency
Equally low frequency outside specialist fields in both regions.
Grammar
How to Use “secondary structure” in a Sentence
The secondary structure of [NOUN PHRASE][VERB] a secondary structuresecondary structure [PREP] [NOUN PHRASE]Vocabulary
Collocations
Examples
Examples of “secondary structure” in a Sentence
verb
British English
- The polypeptide begins to secondary-structure as it exits the ribosome.
- Mutating that residue prevented the domain from secondary-structuring correctly.
American English
- The peptide secondarily structures into a beta-hairpin.
- Researchers observed the chain secondary-structuring in real time.
adverb
British English
- The protein folded secondarily before achieving its tertiary fold.
- The data was analysed secondarily for structural motifs.
American English
- The domain is secondarily structured as a bundle of helices.
- He spoke secondarily about the structure before discussing function.
adjective
British English
- The secondary-structural elements were clearly visible in the cryo-EM map.
- We performed a secondary-structural analysis.
American English
- The secondary-structure prediction algorithm was highly accurate.
- Secondary-structural features were annotated in the database.
Usage
Meaning in Context
Business
Virtually never used. A metaphorical extension might be 'the secondary structure of our investment portfolio' to describe underlying asset groupings.
Academic
Predominant context. Used in biochemistry, molecular biology, biophysics, and related life science publications and lectures.
Everyday
Extremely rare. Would only be used by a specialist explaining their work.
Technical
Core term in structural biology, bioinformatics (for prediction algorithms), and materials science.
Vocabulary
Synonyms of “secondary structure”
Strong
Neutral
Weak
Vocabulary
Antonyms of “secondary structure”
Watch out
Common Mistakes When Using “secondary structure”
- Using 'secondary structure' to refer to the overall 3D shape (that's tertiary structure).
- Pronouncing 'structure' with a /aɪ/ sound in the first syllable (it's /ʌ/ or /ə/).
- Misspelling as 'secondery structure'.
- Using it without the necessary scientific context, leading to confusion.
FAQ
Frequently Asked Questions
No, it is a key concept for nucleic acids (DNA/RNA) as well, describing formations like hairpin loops, stems, and bulges.
Secondary structure refers to local, repetitive folding patterns (helices, sheets). Tertiary structure is the global, three-dimensional arrangement of the entire chain, including how secondary structure elements pack together.
In a denatured or partially folded state, yes. A peptide might form transient helices or sheets (secondary structure) without adopting a unique, stable tertiary fold.
It is a crucial step in protein structure prediction (bioinformatics) and helps understand protein function, stability, and folding pathways. It's also more reliably predicted from sequence than tertiary structure.
The local, regularly repeating three-dimensional folding patterns of a protein or nucleic acid chain, primarily stabilised by hydrogen bonds, such as alpha helices and beta sheets.
Secondary structure is usually specialist/technical in register.
Secondary structure: in British English it is pronounced /ˌsɛkənd(ə)ri ˈstrʌktʃə/, and in American English it is pronounced /ˌsɛkənˌdɛri ˈstrək(t)ʃər/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of a protein as a sentence: PRIMARY structure is the letter sequence (amino acids), SECONDARY structure is the punctuation and word grouping (helices/sheets), and TERTIARY structure is the full paragraph meaning (3D shape).
Conceptual Metaphor
HIERARCHY OF ORGANISATION (Primary = list, Secondary = local patterns, Tertiary = final assembled form). ARCHITECTURE (Primary = bricks, Secondary = walls/beams, Tertiary = complete building).
Practice
Quiz
What primarily stabilises the secondary structure of a protein?